<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS样式表案例</title>
    <link rel="stylesheet" type="text/css" href="chapter_three\CSS相关案例\CSS文件\mystyle.css">
    <style>
        hr {background-color:sienna;border: 5px;height: 5px;}
        #a {margin-left:80px;}
        body {background-image:url('https://t7.baidu.com/it/u=2168645659,3174029352&fm=193&f=GIF');}
        h3{
            text-align:right;
            font-size:20pt;
        }
    </style>
</head>
<body>
    <p>这是一个段落</p>
    <hr>
    <p id="a">这是另一个段落</p>
    <p style="color:sienna;margin-left:20px">这是第三个段落。</p>
    <h3>这是一个标题</h3>
</body>
</html>